Packing for crank-cases of internal-combustion engines.



W. MACDONALD, JR-

PACKING FOR CRANK CASES OF INTERNAL COMBUSTION ENGINES.

APPLICATION flLED NOV. 4. IBM.

1 ,1 1 A99 Patel rbed Nov. 23, 1915.

INVENTOR. WITNESSES: Walllalam Macolomld J52 X ATTORNEY WILLIAM MACDONALD, JR, 015 ALAME D A, CALIFORNIA, ASSIGNOR TO UNITED ENGINEERING WORKS, OF SAN ANCISCO, CALIFORNIA, A CORPORATION 015 PACKING FOR CRANK-CASES OF INTERNAL-COMBUSTION ENGINES.

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Specification of Letters Patent.

Patented Nov. 23, I915.

Application filed November 2:, 1914. Serial No. 870,210.

To all whom it may concern:

Be it known that 1, WILLIAM MACDONALD, Jr., a citizen of the United States, residing at Alameda, in the county of Alameda and State of California, have invented new and useful Improvements in Packing for Crank- Cases of Internal-Combustion Engines, of which the following is a specification.

This invention relates to improvements in that class of internal combustion engines in which atmospheric air, drawn into the crank case by the backward movement of the piston, is then compressed therein by its forward movement, and, at a suitable point in the stroke of-the piston, is admitted to the combustion cylinder to scavenge the waste gases and supply oxygen for the next combustion in said cylinder.

The object of the invention is to provide means for rendering air-tight the crank chamber of the engine to prevent the escape therefrom of air during the compression period.

In the accompanying drawing, Figure 1 is a vertical sectional v1ew of a portion of a crank case of an internal combustion engine equipped with my invention; Fig. 2 is a side view of the packing means; Fig. 3 is a side view of the inner portion of said means.

Referring to the drawing, 1 indicates a chamber having bearings 2 for a shaft 3 formed with a U-crank 4. In a circular depression 6 on the outer side of each arm of the crank and surrounding said shaft 3 at a short distance therefrom, is secured by screws 7 screwed through its bottom a channel-shaped ring 8, here shown as in two halves or sections. The circular walls 9 of said ring sections are joined by transverse walls 10, forming long and short arcuate grooves 11, 12, and circular sockets 13. An outer channel-shaped ring 14, also in two halves or sections, is placed over, or outside of, the inner ring, and the inner and outer rings are of such dimensions that the inner ring has an air-tight fit against, and within, the inner surfaces of the walls of the outer ring. The rings are. arranged with the planes of separation of their sections at right angles to one another. The sections of the outer ring are formed with bosses 16 which register with each other and are tapped to receive screws 17 which, being screwed through said bosses, draw the same tightly together. Said inner and outer rings thus ointly constitute a packing ring. To prevent motion of the outer ring relatively to the inner ring the two sections of the outer rin are formed at their ends with lugs 18 m1 way between its walls which lugs, when the two sections of the outer ringare placed together, abut against each other and are received in. the short arcuate grooves 12 in the inner ring. In the circular sockets 13 in the inner ring are placed helical springs 19, the outer ends of which abut against the bottom of the groove in the outer ring. Two registering minute holes 20 are formed through the outer walls of both rings, the object of which is to obtain a pressure in the channels of the packing rings intermediate between that in the crank case and atmospheric pressure. and outer rings are such that the pressure of the coiled springs holds the, bottom of the outer ring tightly against the casing while the crank revolves. Thus the escape of air from the crank chamber into the space immediately around the shaft is effectually prevented.

I claim 1. A packing ring comprising inner and outer channel-shaped rings one within the other and springs within the rings adapted to press said. rings apart.

2. A packing ring comprising inner and outer channel-shaped rings one within the other and springs within the rings adapted to press said rings apart, the outer walls of the rings having registering small holes therethrough.

3. A packing ring comprising inner and outer channel-shaped rings one within the other and springs within the rings adapted to press said rings apart, said rings being divided, in different .planes, each into two sections.

4:. In combination with a crank case, and a 'U-shaped crank shaft rotatable in apertures through said case, each arm of said crank having a groove around the shaft, means for preventing the passage of air from the interior of the crank case to said in testimony whereof I have hereunto set apertures, comprising a channel-shaped rin my hand in the presence of two subscribing seated in sald groove and secured to sai wltnesses.

crank case, a second channel-shaped ring, WILLIAM MACDONALD, JR. 5 the walls of which engage with a tight t Witnesses:

those of the first ring, and coiled springs FRANCIS M. WRIGHT,

between the two rings. D. B. RICHARDS. 

